49 lines
898 B
C
49 lines
898 B
C
/*local function gcd(a,b)
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if b == 0 then return a end
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return gcd(b, math.fmod(a, b))
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end
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local function lcm(a)
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local out = a[1]
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for i=2,#a do
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out = ((a[i] * out)) / (gcd(a[i], out))
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end
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return out
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end
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*/
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#include "math.h"
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#include "stdint.h"
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#include <stdlib.h>
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uint64_t gcd(uint64_t a, uint64_t b){
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if(b == 0) return a;
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return gcd(b, a % b);
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}
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uint64_t lcm(uint64_t* a, size_t len){
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uint64_t out = a[0];
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for(size_t i = 1; i != len; i++){
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out = (a[i] * out) / gcd(a[i], out);
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}
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return out;
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}
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int l_lcm(lua_State* L){
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luaL_checktype(L, 1, LUA_TTABLE);
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size_t len = lua_objlen(L,1);
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uint64_t* nums = malloc(sizeof * nums * len);
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for(size_t i = 0; i <= len-1; i++){
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lua_pushinteger(L,i+1);
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lua_gettable(L,1);
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nums[i] = luaL_checknumber(L, -1);
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lua_pop(L,1);
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}
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lua_pushnumber(L, lcm(nums, len));
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free(nums);
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return 1;
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}
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